Ferrate(VI) Oxidation of Recalcitrant Compounds: Removal of Biological Resistant Organic Molecules by Ferrate(VI)
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The oxidation of recalcitrant compounds, ethylenediaminetetraacetate (EDTA) and sulfamethoxazole (SMX) by ferrate(VI) (Fe(VI), FeVIO4 2-) is presented. Kinetics of the reactions were determined as a function of pH at 25 C by a stopped-flow technique. The rate law for the oxidation of these compounds by Fe(VI) is first-order with respect to each reactant. The observed second-order rate constants for the reaction of Fe(VI) with SMX decreased non-linearly with increase in pH and are possibly related to protonations of Fe(VI) and compounds. The individual rate constants, k (M-1s-1) of Fe(VI) species, HFeO4 - And FeO42- with protonated and deprotonated forms of compounds were estimated. The HFeO4 - species reacts much faster with these compounds than does the FeO42- species. The results showed that Fe(VI) has the potential to serve as an environmentally-friendly oxidant for removing biologically resistant organic molecules within minutes and converting them to relatively less toxic by-products in water. 2008 American Chemical Society.